– Lat/Long: 48.71° N 121.99° W
South Twin Sister
Weather Forecast, United StatesIssued: 10 pm Wed 19 Aug Local TimeUpdates in: hr min sUpdate imminent
Issued: 10 pm Wed 19 Aug Local Time
Updates in:
Update imminent hr min s
Issued: 10 pm Wed 19 Aug Local Time
Updates in:
Update imminent hr min s
3 South Twin Sister Elevations: 3 Forecast Elevations: Days 1–4 Weather SummaryLight rain (total 3mm), mostly falling on Sat afternoon. Warm (max 30°C on Fri afternoon, min 16°C on Sat afternoon). Wind will be generally light. | Days 5–7 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Warm (max 23°C on Mon afternoon, min 13°C on Sat night). Wind will be generally light. | |||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||
night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | AM | PM | night | |
 | | |  |  | |  |  | |  | |  | | | | | |
clear | clear | clear | clear | some clouds | some clouds | rain shwrs | light rain | light rain | light rain | light rain | rain shwrs | rain shwrs | clear | clear | clear | |
Cloud base (m) | 4700 | 4950 | 3500 | 600 | 600 | 600 | 600 | 700 | ||||||||
km/h | ||||||||||||||||
 |  |  |  |  |  | |||||||||||
 cm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
mm | — | — | — | — | — | — | 0.2 | 1.1 | 2 | 2 | 1.9 | 0.4 | 0.1 | — | — | — |
max °C | 20 | 24 | 28 | 23 | 27 | 30 | 24 | 19 | 17 | 15 | 13 | 16 | 15 | 19 | 23 | 18 |
min °C | 18 | 20 | 27 | 21 | 23 | 29 | 21 | 18 | 16 | 13 | 13 | 14 | 13 | 15 | 23 | 15 |
chill °C | 18 | 20 | 27 | 21 | 23 | 29 | 21 | 18 | 16 | 12 | 12 | 14 | 13 | 15 | 23 | 15 |
Freezing level m | 4350 | 4300 | 4400 | 4500 | 4550 | 4500 | 4150 | 4050 | 3600 | 3050 | 3000 | 3400 | 3750 | 3800 | 3850 | 3750 |
 | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — |
 | — | — | — | 8:14 | — | — | 8:12 | — | — | 8:09 | — | — | 8:07 | — | — | 8:06 |
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South Twin Sister Weather (Days 0-3):
The weather forecast for South Twin Sister is: Light rain (total 3mm), mostly falling on Sat afternoon. Warm (max 30°C on Fri afternoon, min 16°C on Sat afternoon). Wind will be generally light.
South Twin Sister Weather (Days 3-6):
Light rain (total 5mm), mostly falling on Sat night. Warm (max 23°C on Mon afternoon, min 13°C on Sat night). Wind will be generally light.
This table gives the weather forecast for South Twin Sister at the specific elevation of 500 m. Our advanced weather models allow us to provide distinct weather forecasts for several elevations of South Twin Sister. To see the weather forecasts for the other elevations, use the tab navigation above the table. For a wider overview of the weather, consult the Weather Map of Washington.
| Weather Station | Temp. | Weather | Wind | Gusts | Cloud / Visibility |
|---|---|---|---|---|---|
 | |||||
Bellingham Airport | | ||||
* NOTE: not all weather observatories update at the same frequency which is the reason why some locations may show data from stations that are further away than known closer ones.